mirror of
https://github.com/livekit/livekit.git
synced 2026-06-08 02:12:29 +00:00
Raja Subramanian
440f00bcac
* Declare audio inactive if stale. Stale samples were used to declare audio active. Maintain last update time and declare inactive if samples are stale. * correct comment * spelling * check level in test
122 lines
3.8 KiB
Go
122 lines
3.8 KiB
Go
// Copyright 2023 LiveKit, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package audio
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import (
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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)
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const (
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samplesPerBatch = 25
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defaultActiveLevel = 30
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// requires two noisy samples to count
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defaultPercentile = 10
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defaultObserveDuration = 500 // ms
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)
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func TestAudioLevel(t *testing.T) {
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t.Run("initially to return not noisy, within a few samples", func(t *testing.T) {
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clock := time.Now()
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a := createAudioLevel(defaultActiveLevel, defaultPercentile, defaultObserveDuration)
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_, noisy := a.GetLevel(clock)
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require.False(t, noisy)
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observeSamples(a, 28, 5, clock)
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clock = clock.Add(5 * 20 * time.Millisecond)
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_, noisy = a.GetLevel(clock)
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require.False(t, noisy)
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})
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t.Run("not noisy when all samples are below threshold", func(t *testing.T) {
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clock := time.Now()
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a := createAudioLevel(defaultActiveLevel, defaultPercentile, defaultObserveDuration)
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observeSamples(a, 35, 100, clock)
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clock = clock.Add(100 * 20 * time.Millisecond)
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_, noisy := a.GetLevel(clock)
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require.False(t, noisy)
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})
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t.Run("not noisy when less than percentile samples are above threshold", func(t *testing.T) {
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clock := time.Now()
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a := createAudioLevel(defaultActiveLevel, defaultPercentile, defaultObserveDuration)
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observeSamples(a, 35, samplesPerBatch-2, clock)
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clock = clock.Add((samplesPerBatch - 2) * 20 * time.Millisecond)
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observeSamples(a, 25, 1, clock)
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clock = clock.Add(20 * time.Millisecond)
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observeSamples(a, 35, 1, clock)
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clock = clock.Add(20 * time.Millisecond)
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_, noisy := a.GetLevel(clock)
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require.False(t, noisy)
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})
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t.Run("noisy when higher than percentile samples are above threshold", func(t *testing.T) {
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clock := time.Now()
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a := createAudioLevel(defaultActiveLevel, defaultPercentile, defaultObserveDuration)
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observeSamples(a, 35, samplesPerBatch-16, clock)
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clock = clock.Add((samplesPerBatch - 16) * 20 * time.Millisecond)
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observeSamples(a, 25, 8, clock)
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clock = clock.Add(8 * 20 * time.Millisecond)
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observeSamples(a, 29, 8, clock)
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clock = clock.Add(8 * 20 * time.Millisecond)
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level, noisy := a.GetLevel(clock)
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require.True(t, noisy)
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require.Greater(t, level, ConvertAudioLevel(float64(defaultActiveLevel)))
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require.Less(t, level, ConvertAudioLevel(float64(25)))
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})
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t.Run("not noisy when samples are stale", func(t *testing.T) {
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clock := time.Now()
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a := createAudioLevel(defaultActiveLevel, defaultPercentile, defaultObserveDuration)
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observeSamples(a, 25, 100, clock)
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clock = clock.Add(100 * 20 * time.Millisecond)
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level, noisy := a.GetLevel(clock)
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require.True(t, noisy)
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require.Greater(t, level, ConvertAudioLevel(float64(defaultActiveLevel)))
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require.Less(t, level, ConvertAudioLevel(float64(20)))
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// let enough time pass to make the samples stale
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clock = clock.Add(1500 * time.Millisecond)
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level, noisy = a.GetLevel(clock)
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require.Equal(t, float64(0.0), level)
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require.False(t, noisy)
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})
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}
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func createAudioLevel(activeLevel uint8, minPercentile uint8, observeDuration uint32) *AudioLevel {
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return NewAudioLevel(AudioLevelParams{
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ActiveLevel: activeLevel,
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MinPercentile: minPercentile,
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ObserveDuration: observeDuration,
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})
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}
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func observeSamples(a *AudioLevel, level uint8, count int, baseTime time.Time) {
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for i := 0; i < count; i++ {
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a.Observe(level, 20, baseTime.Add(+time.Duration(i*20)*time.Millisecond))
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}
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}
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